Lo-fi sci-fi, hollow metal people and Churchill’s big guns – the week in art

First major retrospective for the wartime PM’s paintings, shadows of Berlin Dada, hopeful science and the outrageous art of Valie Export – all in your weekly dispatch

Winston Churchill: The Painter
Britain’s eloquent war leader kept himself sane by puffing on cigars, swilling brandy – and painting the world around him.

• The Wallace Collection, London, from 23 May to 29 November
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